Android + Stagefright = Disaster
Let me stress this out once more: the patches are ready to go. They were approved by Google months ago. But you won’t get them for another few weeks (if you’re lucky) or months (most likely) or never (a very solid possibility) depending how old your phone is—if it’s too old manufacturers just stop supporting them—and how lackadaisical your manufacturer and carrier are with regards to updates. Given the open nature of Android, pushing out updates, as Android Central put it, is a “messy, unpredictable business” that requires a lot of “moving parts.
This is the fundamental difference between Android and iPhone. When there’s a bug on iOS, Apple patches it and can push an update to all iPhone users as soon as it’s ready, no questions asked.
Source: Goodbye, Android | Motherboard